For 2026, compare MRCOOL and Zone Air: 24 SEER2 vs 23 SEER2. MRCOOL is best...

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For 2026, compare MRCOOL and Zone Air: 24 SEER2 vs 23 SEER2. MRCOOL is best value above -15°F. Need heat in deeper cold? Zone Air’s Hyper Heat runs down to -22°F. Pick based on your winter lows, not just the small efficiency gap.